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在使用721型分光光度计中,发现仪器光源灯发光强度失调,有时并非仪器的光亮调节器(100%电位器)损坏,只是由于使用仪器不当而导致稳压线路中其它元器件损坏。如在开机前,光亮调节器处于最大位置,加之光源灯功率大,此时开机,会因负载电流从零变到几安培,使输出电压和基准电压差值大,再经运算放大器差分放大,导致保护管BG_(11)或调整管BG_9、BG_(10)过载损坏,使其输出电压失准,引起光源灯发光强度失调。可更换保护管
In the use of 721 spectrophotometer, found that the light intensity of the instrument light source is out of tune, and sometimes not the instrument of the light regulator (100% potentiometer) damage, but due to improper use of equipment caused by the regulator circuit damage to other components. Such as in the boot, the light regulator in the maximum position, coupled with light source power, this time the boot, the load current will change from zero to several amperes, the output voltage and the reference voltage difference, and then amplified by the differential amplifier, As a result, the overvoltage damage of the BG_ (11) or BG_9 and BG_ (10) protection tubes causes the output voltage to be misaligned, resulting in the imbalance of the luminous intensity of the light source lamp. Replaceable protective tube